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Income taxes - Net long-term deferred tax liability (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Deferred tax assets: |  |
Operating loss carryforwards - Mexico | $ 3,427,295 | $ 3,020,049
Land basis difference - Mexico | 1,164,365 | 999,719
Start-up costs - Mexico | 4,608,990 | 3,856,942
Research & development tax credits - U.S. | 166,653 | 0
Valuation allowances | (9,244,550) | (7,876,710)
Deferred Tax Assets, Net of Valuation Allowance | 122,753 | 0
Deferred tax liabilities: |  |
Property and equipment - U.S. | 148,707 | 180,431
Intangible assets - U.S. | 1,380,328 | 479,443
Deferred Tax Liabilities, Gross | 1,529,035 | 659,874
Net deferred tax liability | $ 1,406,282 | $ 659,874

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